He studied Red Junk Wing Chun in the US for about 6 years time. Same guy that taught James Keating . He was Bruce's dads friend. Bruce picked him up from the docks with Jesse Glover. According to Jesse Glovers book. So he studied longer and first hand with a different style of wing chun right here. Beside, the dude went every where and learned from anyone. Ask the Willem Reeders boys about him learning from Reeders. I guess he was one of only 3 people ever to learn Reeders family style. It is also where he came up with the idea for Kung Fu tv series. But he lost that role. To Chinese!
A lot of people believe the bull**** he learned only in HK from 13-18 and not at the hands of Yip Man. It simply is not true.
Again, reference Between Wing Chun and Jeet Kune Do by Jesse Glover.
Edit. I wrote James Sass. I meant James Keating-corrected.